Brush



J. F. RBERT.

(No M el) B USH.

Patented Mar. 22, 1898.

UNIT D STATES- PATENT OFFICE.-

JOHN F. HERBERT,OF KINGSTON, NEw YORK.

BRUSH.

SPECIFICATION forming part of Letters I'atent No. 601,056, dated March 22, 1898 Application filedl'fune 11,1897. Serial No. 640,284. (No model.)

To all whom it may concern:

Be it known that I, JOHN F. HERBERT, of Kingston, .in the county of Ulster, State of New York, have invented certain new and useful Improvements in Brushes, of which the following is a complete specification, reference being had to the accompanying drawings.

My invention relates to means for uniting a brush block and back, and has for its object the production of a serviceable, durable, and finished article that on account of its struc ture is especially adapted to resist the injurious effects of moisture.

The method of manufacturing brushes commonly practiced at the present day consists in providing a brush-block, as by boring, with a series of apertures or sockets for the recep-v tion, respectively, of tufts of bristles or similar material. The tufts of bristles are secured within the sockets by a continuous thread or strand of wire extending from one to the other of the sockets. By this method the brush-block is commonly perforated upon its back, over which also extends the tuftsecuring thread or wire.

In order to finish the brush, it is necessary to secure to the back of the brush-block a covering or finished back.

In addition to the transversely-perforated brush-block a method of manufacture has been employed which consists in producing in the brush-block transverse recesses which extend only partially through the block and in the manufacture ofsolid-back brushes the Heretofore the means employed for uniting a finishing-back to an open brush-block have been'objectionable on account of the tendency of the back to separate from the block. This has been particularly the casein brushes intended to be subjected to moisture-as, for example, in the bath or the like. Such conditions exclude the sole use of glue, the ordinary material for uniting the back to the block, and has necessitated the employment of some more permanent and reliable means of union.for example, screws. In practice, however, the use of screws in the ordinary way is obj ectionable, because the strength of the material of the brush-block and its capacity to resist cleavage strain being reduced by the formation of the bristle-sockets it is difficult in practice to employ the screws to advantage in firmly uniting the back to the block.

My invention consists in forming the block and'the back so that they may be united by retaining membersas, for example, screws inserted through flanges or laterally-disposed walls of the back into the body of the material composing the brush-block. By this method the screws are firmly fitted into the material of the brush-block, and, being inserted transversely to the bristle-sockets, the strength and durability of the brush-block is not impaired, but rather improved, and the finished article presents a back whose surface is as smooth and unbroken as the solidback brush. Moreover, the ends of the block are solid and free from the borings above referred to as employed in the manufacture of solid-back brushes.

In the accompanying drawings, Figure I is an end perspective view of my brush complete. Fig. II is a similar view of the same with the back removed, looking at the block from above. Fig. III is a similar view of the back detached and reversed. Fig. IV is a transverse section on the line IV IV of Fig. I.

Referring to the figures on the drawings, 1 indicates a brush-block; 2, the bristles, attached thereto by any preferred means. As

illustrated, the tufts or bristles are inserted, respectively, into the sockets 3 and are secured therein, as by a strand of wire 4. As above suggested, however, the means illustrated are shown by way of example solely.

In carrying out my invention I provide the brush-block with a longitudinally-disposed medially-located rib 6, which may be formed, as by rabbets 7, in the opposite edges of the block. As is well understood in the art and as maybe inferred from an inspection of Fig. II of the drawings, the middle portion of the brush-block is most materially weakened by the perforating bristle-sockets. For that reason it is desirable to make the rib wide and high in order to increase the strength and durability of the brush and to prevent checking at its ends, which occurs where proper care and judgment are not exercised in the design, structure, and manufacture of the block.

8 indicates the brush-back, which is provided with a channel 9, adapted to receive and snugly fit the rib O. The channel is defined by side pieces or flanges 10, which overlap the rib 6 and, fitting within the rabbets 7, extend at all points flush with the edge of the brush-block, so that the back and block together in the finished article constitute in eitect one piece.

I11 unitingthe back to the block I employ, in addition to suitable plastic or adhesive material for excluding moisture from the joint formed by the union of the parts, suitable binding members, preferably screws 11. The screws are introduced transversely through the flanges and, entering the sides of the rib 6, secure a firm purchase upon the material of which the brush-block is composed, thus insuring a permanent union between the parts without injuriously altecting the strength of the brush-block.

In practice the screws are preferably introduced obliquely, their points extending toward the bristles. By this means the tendency of the screws is to positively draw the back and the block together.

That I claim is 1. In a brush, the combination with a block and a back cor-relatively grooved,0f obliquelydisposed binding members assembled sub stantially in the manner and for the purpose specified.

2. The combination with a brush-block and rib thereon, of a back provided with a channel fitted to and adapted to receive the rib, and means for uniting the parts entering the brush-block substantially transverse to the bristle-sockets therein substantially as and for the purpose specified.

3. The combination with a brush-block provided with rib-defining rabbets upon opposite sides, of a back, channel-defining flanges adapted to fit the rabbets, and binding members extending through the flanges into the central rib of the block, substantially as and for the purpose specified.

In testimony of all which I have hereunto subscribed my name.

JOHN F. HERBERT.

\Vitnesses:

Jos. M. HERBERT, PERCY O. JUDSON. 

